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<title>class CSV::Parser::InputsScanner - csv: Ruby Standard Library Documentation</title>


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    <li ><a href="#method-i-adjust_last_keep">#adjust_last_keep</a>
    <li ><a href="#method-i-check">#check</a>
    <li ><a href="#method-i-each_line">#each_line</a>
    <li ><a href="#method-i-eos-3F">#eos?</a>
    <li ><a href="#method-i-keep_back">#keep_back</a>
    <li ><a href="#method-i-keep_drop">#keep_drop</a>
    <li ><a href="#method-i-keep_end">#keep_end</a>
    <li ><a href="#method-i-keep_start">#keep_start</a>
    <li ><a href="#method-i-read_chunk">#read_chunk</a>
    <li ><a href="#method-i-rest">#rest</a>
    <li ><a href="#method-i-scan">#scan</a>
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    <main role="main" aria-labelledby="class-CSV::Parser::InputsScanner">
    <h1 id="class-CSV::Parser::InputsScanner" class="class">
      class CSV::Parser::InputsScanner
    </h1>

    <section class="description">
    
<p>CSV::InputsScanner receives IO inputs, encoding and the chunk_size. It also controls the life cycle of the object with its methods <code>keep_start</code>, <code>keep_end</code>, <code>keep_back</code>, <code>keep_drop</code>.</p>

<p>CSV::InputsScanner.scan() tries to match with pattern at the current position. If there’s a match, the scanner advances the “scan pointer” and returns the matched string. Otherwise, the scanner returns nil.</p>

<p>CSV::InputsScanner.rest() returns the “rest” of the string (i.e. everything after the scan pointer). If there is no more data (eos? = true), it returns “”.</p>

    </section>

      <section id="5Buntitled-5D" class="documentation-section">





                <section id="public-class-5Buntitled-5D-method-details" class="method-section">
                <header>
                <h3>Public Class Methods</h3>
                </header>

                  <div id="method-c-new" class="method-detail ">
                            <div class="method-heading">
                              <span class="method-name">new</span><span
                                class="method-args">(inputs, encoding, row_separator, chunk_size: 8192)</span>
                              <span class="method-click-advice">click to toggle source</span>
                            </div>

                            <div class="method-description">
                              

                              <div class="method-source-code" id="new-source">
            <pre><span class="ruby-comment"># File csv/parser.rb, line 87</span>
<span class="ruby-keyword">def</span> <span class="ruby-identifier ruby-title">initialize</span>(<span class="ruby-identifier">inputs</span>, <span class="ruby-identifier">encoding</span>, <span class="ruby-identifier">row_separator</span>, <span class="ruby-value">chunk_size:</span> <span class="ruby-value">8192</span>)
  <span class="ruby-ivar">@inputs</span> = <span class="ruby-identifier">inputs</span>.<span class="ruby-identifier">dup</span>
  <span class="ruby-ivar">@encoding</span> = <span class="ruby-identifier">encoding</span>
  <span class="ruby-ivar">@row_separator</span> = <span class="ruby-identifier">row_separator</span>
  <span class="ruby-ivar">@chunk_size</span> = <span class="ruby-identifier">chunk_size</span>
  <span class="ruby-ivar">@last_scanner</span> = <span class="ruby-ivar">@inputs</span>.<span class="ruby-identifier">empty?</span>
  <span class="ruby-ivar">@keeps</span> = []
  <span class="ruby-identifier">read_chunk</span>
<span class="ruby-keyword">end</span></pre>
                              </div>
                            </div>


                          </div>

                          </section>

                <section id="public-instance-5Buntitled-5D-method-details" class="method-section">
                <header>
                <h3>Public Instance Methods</h3>
                </header>

                  <div id="method-i-check" class="method-detail ">
                            <div class="method-heading">
                              <span class="method-name">check</span><span
                                class="method-args">(pattern)</span>
                              <span class="method-click-advice">click to toggle source</span>
                            </div>

                            <div class="method-description">
                              

                              <div class="method-source-code" id="check-source">
            <pre><span class="ruby-comment"># File csv/parser.rb, line 248</span>
<span class="ruby-keyword">def</span> <span class="ruby-identifier ruby-title">check</span>(<span class="ruby-identifier">pattern</span>)
  <span class="ruby-ivar">@scanner</span>.<span class="ruby-identifier">check</span>(<span class="ruby-identifier">pattern</span>)
<span class="ruby-keyword">end</span></pre>
                              </div>
                            </div>


                          </div>

                  <div id="method-i-each_line" class="method-detail ">
                            <div class="method-heading">
                              <span class="method-name">each_line</span><span
                                class="method-args">(row_separator) { |buffer| ... }</span>
                              <span class="method-click-advice">click to toggle source</span>
                            </div>

                            <div class="method-description">
                              

                              <div class="method-source-code" id="each_line-source">
            <pre><span class="ruby-comment"># File csv/parser.rb, line 97</span>
<span class="ruby-keyword">def</span> <span class="ruby-identifier ruby-title">each_line</span>(<span class="ruby-identifier">row_separator</span>)
  <span class="ruby-keyword">return</span> <span class="ruby-identifier">enum_for</span>(<span class="ruby-identifier">__method__</span>, <span class="ruby-identifier">row_separator</span>) <span class="ruby-keyword">unless</span> <span class="ruby-identifier">block_given?</span>
  <span class="ruby-identifier">buffer</span> = <span class="ruby-keyword">nil</span>
  <span class="ruby-identifier">input</span> = <span class="ruby-ivar">@scanner</span>.<span class="ruby-identifier">rest</span>
  <span class="ruby-identifier">position</span> = <span class="ruby-ivar">@scanner</span>.<span class="ruby-identifier">pos</span>
  <span class="ruby-identifier">offset</span> = <span class="ruby-value">0</span>
  <span class="ruby-identifier">n_row_separator_chars</span> = <span class="ruby-identifier">row_separator</span>.<span class="ruby-identifier">size</span>
  <span class="ruby-comment"># trace(__method__, :start, input)</span>
  <span class="ruby-keyword">while</span> <span class="ruby-keyword">true</span>
    <span class="ruby-identifier">input</span>.<span class="ruby-identifier">each_line</span>(<span class="ruby-identifier">row_separator</span>) <span class="ruby-keyword">do</span> <span class="ruby-operator">|</span><span class="ruby-identifier">line</span><span class="ruby-operator">|</span>
      <span class="ruby-ivar">@scanner</span>.<span class="ruby-identifier">pos</span> <span class="ruby-operator">+=</span> <span class="ruby-identifier">line</span>.<span class="ruby-identifier">bytesize</span>
      <span class="ruby-keyword">if</span> <span class="ruby-identifier">buffer</span>
        <span class="ruby-keyword">if</span> <span class="ruby-identifier">n_row_separator_chars</span> <span class="ruby-operator">==</span> <span class="ruby-value">2</span> <span class="ruby-keyword">and</span>
          <span class="ruby-identifier">buffer</span>.<span class="ruby-identifier">end_with?</span>(<span class="ruby-identifier">row_separator</span>[<span class="ruby-value">0</span>]) <span class="ruby-keyword">and</span>
          <span class="ruby-identifier">line</span>.<span class="ruby-identifier">start_with?</span>(<span class="ruby-identifier">row_separator</span>[<span class="ruby-value">1</span>])
          <span class="ruby-identifier">buffer</span> <span class="ruby-operator">&lt;&lt;</span> <span class="ruby-identifier">line</span>[<span class="ruby-value">0</span>]
          <span class="ruby-identifier">line</span> = <span class="ruby-identifier">line</span>[<span class="ruby-value">1</span><span class="ruby-operator">..</span><span class="ruby-value">-1</span>]
          <span class="ruby-identifier">position</span> <span class="ruby-operator">+=</span> <span class="ruby-identifier">buffer</span>.<span class="ruby-identifier">bytesize</span> <span class="ruby-operator">+</span> <span class="ruby-identifier">offset</span>
          <span class="ruby-ivar">@scanner</span>.<span class="ruby-identifier">pos</span> = <span class="ruby-identifier">position</span>
          <span class="ruby-identifier">offset</span> = <span class="ruby-value">0</span>
          <span class="ruby-keyword">yield</span>(<span class="ruby-identifier">buffer</span>)
          <span class="ruby-identifier">buffer</span> = <span class="ruby-keyword">nil</span>
          <span class="ruby-keyword">next</span> <span class="ruby-keyword">if</span> <span class="ruby-identifier">line</span>.<span class="ruby-identifier">empty?</span>
        <span class="ruby-keyword">else</span>
          <span class="ruby-identifier">buffer</span> <span class="ruby-operator">&lt;&lt;</span> <span class="ruby-identifier">line</span>
          <span class="ruby-identifier">line</span> = <span class="ruby-identifier">buffer</span>
          <span class="ruby-identifier">buffer</span> = <span class="ruby-keyword">nil</span>
        <span class="ruby-keyword">end</span>
      <span class="ruby-keyword">end</span>
      <span class="ruby-keyword">if</span> <span class="ruby-identifier">line</span>.<span class="ruby-identifier">end_with?</span>(<span class="ruby-identifier">row_separator</span>)
        <span class="ruby-identifier">position</span> <span class="ruby-operator">+=</span> <span class="ruby-identifier">line</span>.<span class="ruby-identifier">bytesize</span> <span class="ruby-operator">+</span> <span class="ruby-identifier">offset</span>
        <span class="ruby-ivar">@scanner</span>.<span class="ruby-identifier">pos</span> = <span class="ruby-identifier">position</span>
        <span class="ruby-identifier">offset</span> = <span class="ruby-value">0</span>
        <span class="ruby-keyword">yield</span>(<span class="ruby-identifier">line</span>)
      <span class="ruby-keyword">else</span>
        <span class="ruby-identifier">buffer</span> = <span class="ruby-identifier">line</span>
      <span class="ruby-keyword">end</span>
    <span class="ruby-keyword">end</span>
    <span class="ruby-keyword">break</span> <span class="ruby-keyword">unless</span> <span class="ruby-identifier">read_chunk</span>
    <span class="ruby-identifier">input</span> = <span class="ruby-ivar">@scanner</span>.<span class="ruby-identifier">rest</span>
    <span class="ruby-identifier">position</span> = <span class="ruby-ivar">@scanner</span>.<span class="ruby-identifier">pos</span>
    <span class="ruby-identifier">offset</span> = <span class="ruby-operator">-</span><span class="ruby-identifier">buffer</span>.<span class="ruby-identifier">bytesize</span> <span class="ruby-keyword">if</span> <span class="ruby-identifier">buffer</span>
  <span class="ruby-keyword">end</span>
  <span class="ruby-keyword">yield</span>(<span class="ruby-identifier">buffer</span>) <span class="ruby-keyword">if</span> <span class="ruby-identifier">buffer</span>
<span class="ruby-keyword">end</span></pre>
                              </div>
                            </div>


                          </div>

                  <div id="method-i-eos-3F" class="method-detail ">
                            <div class="method-heading">
                              <span class="method-name">eos?</span><span
                                class="method-args">()</span>
                              <span class="method-click-advice">click to toggle source</span>
                            </div>

                            <div class="method-description">
                              

                              <div class="method-source-code" id="eos-3F-source">
            <pre><span class="ruby-comment"># File csv/parser.rb, line 170</span>
<span class="ruby-keyword">def</span> <span class="ruby-identifier ruby-title">eos?</span>
  <span class="ruby-ivar">@scanner</span>.<span class="ruby-identifier">eos?</span>
<span class="ruby-keyword">end</span></pre>
                              </div>
                            </div>


                          </div>

                  <div id="method-i-keep_back" class="method-detail ">
                            <div class="method-heading">
                              <span class="method-name">keep_back</span><span
                                class="method-args">()</span>
                              <span class="method-click-advice">click to toggle source</span>
                            </div>

                            <div class="method-description">
                              

                              <div class="method-source-code" id="keep_back-source">
            <pre><span class="ruby-comment"># File csv/parser.rb, line 197</span>
<span class="ruby-keyword">def</span> <span class="ruby-identifier ruby-title">keep_back</span>
  <span class="ruby-comment"># trace(__method__, :start)</span>
  <span class="ruby-identifier">scanner</span>, <span class="ruby-identifier">start</span>, <span class="ruby-identifier">buffer</span> = <span class="ruby-ivar">@keeps</span>.<span class="ruby-identifier">pop</span>
  <span class="ruby-keyword">if</span> <span class="ruby-identifier">buffer</span>
    <span class="ruby-comment"># trace(__method__, :rescan, start, buffer)</span>
    <span class="ruby-identifier">string</span> = <span class="ruby-ivar">@scanner</span>.<span class="ruby-identifier">string</span>
    <span class="ruby-keyword">if</span> <span class="ruby-identifier">scanner</span> <span class="ruby-operator">==</span> <span class="ruby-ivar">@scanner</span>
      <span class="ruby-identifier">keep</span> = <span class="ruby-identifier">string</span>.<span class="ruby-identifier">byteslice</span>(<span class="ruby-identifier">start</span>,
                              <span class="ruby-identifier">string</span>.<span class="ruby-identifier">bytesize</span> <span class="ruby-operator">-</span> <span class="ruby-ivar">@scanner</span>.<span class="ruby-identifier">pos</span> <span class="ruby-operator">-</span> <span class="ruby-identifier">start</span>)
    <span class="ruby-keyword">else</span>
      <span class="ruby-identifier">keep</span> = <span class="ruby-identifier">string</span>
    <span class="ruby-keyword">end</span>
    <span class="ruby-keyword">if</span> <span class="ruby-identifier">keep</span> <span class="ruby-keyword">and</span> <span class="ruby-keyword">not</span> <span class="ruby-identifier">keep</span>.<span class="ruby-identifier">empty?</span>
      <span class="ruby-ivar">@inputs</span>.<span class="ruby-identifier">unshift</span>(<span class="ruby-constant">StringIO</span>.<span class="ruby-identifier">new</span>(<span class="ruby-identifier">keep</span>))
      <span class="ruby-ivar">@last_scanner</span> = <span class="ruby-keyword">false</span>
    <span class="ruby-keyword">end</span>
    <span class="ruby-ivar">@scanner</span> = <span class="ruby-constant">StringScanner</span>.<span class="ruby-identifier">new</span>(<span class="ruby-identifier">buffer</span>)
  <span class="ruby-keyword">else</span>
    <span class="ruby-keyword">if</span> <span class="ruby-ivar">@scanner</span> <span class="ruby-operator">!=</span> <span class="ruby-identifier">scanner</span>
      <span class="ruby-identifier">message</span> = <span class="ruby-string">&quot;scanners are different but no buffer: &quot;</span>
      <span class="ruby-identifier">message</span> <span class="ruby-operator">+=</span> <span class="ruby-node">&quot;#{@scanner.inspect}(#{@scanner.object_id}): &quot;</span>
      <span class="ruby-identifier">message</span> <span class="ruby-operator">+=</span> <span class="ruby-node">&quot;#{scanner.inspect}(#{scanner.object_id})&quot;</span>
      <span class="ruby-identifier">raise</span> <span class="ruby-constant">UnexpectedError</span>, <span class="ruby-identifier">message</span>
    <span class="ruby-keyword">end</span>
    <span class="ruby-comment"># trace(__method__, :repos, start, buffer)</span>
    <span class="ruby-ivar">@scanner</span>.<span class="ruby-identifier">pos</span> = <span class="ruby-identifier">start</span>
  <span class="ruby-keyword">end</span>
  <span class="ruby-identifier">read_chunk</span> <span class="ruby-keyword">if</span> <span class="ruby-ivar">@scanner</span>.<span class="ruby-identifier">eos?</span>
<span class="ruby-keyword">end</span></pre>
                              </div>
                            </div>


                          </div>

                  <div id="method-i-keep_drop" class="method-detail ">
                            <div class="method-heading">
                              <span class="method-name">keep_drop</span><span
                                class="method-args">()</span>
                              <span class="method-click-advice">click to toggle source</span>
                            </div>

                            <div class="method-description">
                              

                              <div class="method-source-code" id="keep_drop-source">
            <pre><span class="ruby-comment"># File csv/parser.rb, line 227</span>
<span class="ruby-keyword">def</span> <span class="ruby-identifier ruby-title">keep_drop</span>
  <span class="ruby-identifier">_</span>, <span class="ruby-identifier">_</span>, <span class="ruby-identifier">buffer</span> = <span class="ruby-ivar">@keeps</span>.<span class="ruby-identifier">pop</span>
  <span class="ruby-comment"># trace(__method__, :done, :empty) unless buffer</span>
  <span class="ruby-keyword">return</span> <span class="ruby-keyword">unless</span> <span class="ruby-identifier">buffer</span>

  <span class="ruby-identifier">last_keep</span> = <span class="ruby-ivar">@keeps</span>.<span class="ruby-identifier">last</span>
  <span class="ruby-comment"># trace(__method__, :done, :no_last_keep) unless last_keep</span>
  <span class="ruby-keyword">return</span> <span class="ruby-keyword">unless</span> <span class="ruby-identifier">last_keep</span>

  <span class="ruby-keyword">if</span> <span class="ruby-identifier">last_keep</span>[<span class="ruby-value">2</span>]
    <span class="ruby-identifier">last_keep</span>[<span class="ruby-value">2</span>] <span class="ruby-operator">&lt;&lt;</span> <span class="ruby-identifier">buffer</span>
  <span class="ruby-keyword">else</span>
    <span class="ruby-identifier">last_keep</span>[<span class="ruby-value">2</span>] = <span class="ruby-identifier">buffer</span>
  <span class="ruby-keyword">end</span>
  <span class="ruby-comment"># trace(__method__, :done)</span>
<span class="ruby-keyword">end</span></pre>
                              </div>
                            </div>


                          </div>

                  <div id="method-i-keep_end" class="method-detail ">
                            <div class="method-heading">
                              <span class="method-name">keep_end</span><span
                                class="method-args">()</span>
                              <span class="method-click-advice">click to toggle source</span>
                            </div>

                            <div class="method-description">
                              

                              <div class="method-source-code" id="keep_end-source">
            <pre><span class="ruby-comment"># File csv/parser.rb, line 181</span>
<span class="ruby-keyword">def</span> <span class="ruby-identifier ruby-title">keep_end</span>
  <span class="ruby-comment"># trace(__method__, :start)</span>
  <span class="ruby-identifier">scanner</span>, <span class="ruby-identifier">start</span>, <span class="ruby-identifier">buffer</span> = <span class="ruby-ivar">@keeps</span>.<span class="ruby-identifier">pop</span>
  <span class="ruby-keyword">if</span> <span class="ruby-identifier">scanner</span> <span class="ruby-operator">==</span> <span class="ruby-ivar">@scanner</span>
    <span class="ruby-identifier">keep</span> = <span class="ruby-ivar">@scanner</span>.<span class="ruby-identifier">string</span>.<span class="ruby-identifier">byteslice</span>(<span class="ruby-identifier">start</span>, <span class="ruby-ivar">@scanner</span>.<span class="ruby-identifier">pos</span> <span class="ruby-operator">-</span> <span class="ruby-identifier">start</span>)
  <span class="ruby-keyword">else</span>
    <span class="ruby-identifier">keep</span> = <span class="ruby-ivar">@scanner</span>.<span class="ruby-identifier">string</span>.<span class="ruby-identifier">byteslice</span>(<span class="ruby-value">0</span>, <span class="ruby-ivar">@scanner</span>.<span class="ruby-identifier">pos</span>)
  <span class="ruby-keyword">end</span>
  <span class="ruby-keyword">if</span> <span class="ruby-identifier">buffer</span>
    <span class="ruby-identifier">buffer</span> <span class="ruby-operator">&lt;&lt;</span> <span class="ruby-identifier">keep</span>
    <span class="ruby-identifier">keep</span> = <span class="ruby-identifier">buffer</span>
  <span class="ruby-keyword">end</span>
  <span class="ruby-comment"># trace(__method__, :done, keep)</span>
  <span class="ruby-identifier">keep</span>
<span class="ruby-keyword">end</span></pre>
                              </div>
                            </div>


                          </div>

                  <div id="method-i-keep_start" class="method-detail ">
                            <div class="method-heading">
                              <span class="method-name">keep_start</span><span
                                class="method-args">()</span>
                              <span class="method-click-advice">click to toggle source</span>
                            </div>

                            <div class="method-description">
                              

                              <div class="method-source-code" id="keep_start-source">
            <pre><span class="ruby-comment"># File csv/parser.rb, line 174</span>
<span class="ruby-keyword">def</span> <span class="ruby-identifier ruby-title">keep_start</span>
  <span class="ruby-comment"># trace(__method__, :start)</span>
  <span class="ruby-identifier">adjust_last_keep</span>
  <span class="ruby-ivar">@keeps</span>.<span class="ruby-identifier">push</span>([<span class="ruby-ivar">@scanner</span>, <span class="ruby-ivar">@scanner</span>.<span class="ruby-identifier">pos</span>, <span class="ruby-keyword">nil</span>])
  <span class="ruby-comment"># trace(__method__, :done)</span>
<span class="ruby-keyword">end</span></pre>
                              </div>
                            </div>


                          </div>

                  <div id="method-i-rest" class="method-detail ">
                            <div class="method-heading">
                              <span class="method-name">rest</span><span
                                class="method-args">()</span>
                              <span class="method-click-advice">click to toggle source</span>
                            </div>

                            <div class="method-description">
                              

                              <div class="method-source-code" id="rest-source">
            <pre><span class="ruby-comment"># File csv/parser.rb, line 244</span>
<span class="ruby-keyword">def</span> <span class="ruby-identifier ruby-title">rest</span>
  <span class="ruby-ivar">@scanner</span>.<span class="ruby-identifier">rest</span>
<span class="ruby-keyword">end</span></pre>
                              </div>
                            </div>


                          </div>

                  <div id="method-i-scan" class="method-detail ">
                            <div class="method-heading">
                              <span class="method-name">scan</span><span
                                class="method-args">(pattern)</span>
                              <span class="method-click-advice">click to toggle source</span>
                            </div>

                            <div class="method-description">
                              

                              <div class="method-source-code" id="scan-source">
            <pre><span class="ruby-comment"># File csv/parser.rb, line 143</span>
<span class="ruby-keyword">def</span> <span class="ruby-identifier ruby-title">scan</span>(<span class="ruby-identifier">pattern</span>)
  <span class="ruby-comment"># trace(__method__, pattern, :start)</span>
  <span class="ruby-identifier">value</span> = <span class="ruby-ivar">@scanner</span>.<span class="ruby-identifier">scan</span>(<span class="ruby-identifier">pattern</span>)
  <span class="ruby-comment"># trace(__method__, pattern, :done, :last, value) if @last_scanner</span>
  <span class="ruby-keyword">return</span> <span class="ruby-identifier">value</span> <span class="ruby-keyword">if</span> <span class="ruby-ivar">@last_scanner</span>

  <span class="ruby-identifier">read_chunk</span> <span class="ruby-keyword">if</span> <span class="ruby-identifier">value</span> <span class="ruby-keyword">and</span> <span class="ruby-ivar">@scanner</span>.<span class="ruby-identifier">eos?</span>
  <span class="ruby-comment"># trace(__method__, pattern, :done, value)</span>
  <span class="ruby-identifier">value</span>
<span class="ruby-keyword">end</span></pre>
                              </div>
                            </div>


                          </div>

                  <div id="method-i-scan_all" class="method-detail ">
                            <div class="method-heading">
                              <span class="method-name">scan_all</span><span
                                class="method-args">(pattern)</span>
                              <span class="method-click-advice">click to toggle source</span>
                            </div>

                            <div class="method-description">
                              

                              <div class="method-source-code" id="scan_all-source">
            <pre><span class="ruby-comment"># File csv/parser.rb, line 154</span>
<span class="ruby-keyword">def</span> <span class="ruby-identifier ruby-title">scan_all</span>(<span class="ruby-identifier">pattern</span>)
  <span class="ruby-comment"># trace(__method__, pattern, :start)</span>
  <span class="ruby-identifier">value</span> = <span class="ruby-ivar">@scanner</span>.<span class="ruby-identifier">scan</span>(<span class="ruby-identifier">pattern</span>)
  <span class="ruby-comment"># trace(__method__, pattern, :done, :last, value) if @last_scanner</span>
  <span class="ruby-keyword">return</span> <span class="ruby-identifier">value</span> <span class="ruby-keyword">if</span> <span class="ruby-ivar">@last_scanner</span>

  <span class="ruby-comment"># trace(__method__, pattern, :done, :nil) if value.nil?</span>
  <span class="ruby-keyword">return</span> <span class="ruby-keyword">nil</span> <span class="ruby-keyword">if</span> <span class="ruby-identifier">value</span>.<span class="ruby-identifier">nil?</span>
  <span class="ruby-keyword">while</span> <span class="ruby-ivar">@scanner</span>.<span class="ruby-identifier">eos?</span> <span class="ruby-keyword">and</span> <span class="ruby-identifier">read_chunk</span> <span class="ruby-keyword">and</span> (<span class="ruby-identifier">sub_value</span> = <span class="ruby-ivar">@scanner</span>.<span class="ruby-identifier">scan</span>(<span class="ruby-identifier">pattern</span>))
    <span class="ruby-comment"># trace(__method__, pattern, :sub, sub_value)</span>
    <span class="ruby-identifier">value</span> <span class="ruby-operator">&lt;&lt;</span> <span class="ruby-identifier">sub_value</span>
  <span class="ruby-keyword">end</span>
  <span class="ruby-comment"># trace(__method__, pattern, :done, value)</span>
  <span class="ruby-identifier">value</span>
<span class="ruby-keyword">end</span></pre>
                              </div>
                            </div>


                          </div>

                          </section>

                <section id="private-instance-5Buntitled-5D-method-details" class="method-section">
                <header>
                <h3>Private Instance Methods</h3>
                </header>

                  <div id="method-i-adjust_last_keep" class="method-detail ">
                            <div class="method-heading">
                              <span class="method-name">adjust_last_keep</span><span
                                class="method-args">()</span>
                              <span class="method-click-advice">click to toggle source</span>
                            </div>

                            <div class="method-description">
                              

                              <div class="method-source-code" id="adjust_last_keep-source">
            <pre><span class="ruby-comment"># File csv/parser.rb, line 257</span>
<span class="ruby-keyword">def</span> <span class="ruby-identifier ruby-title">adjust_last_keep</span>
  <span class="ruby-comment"># trace(__method__, :start)</span>

  <span class="ruby-identifier">keep</span> = <span class="ruby-ivar">@keeps</span>.<span class="ruby-identifier">last</span>
  <span class="ruby-comment"># trace(__method__, :done, :empty) if keep.nil?</span>
  <span class="ruby-keyword">return</span> <span class="ruby-keyword">if</span> <span class="ruby-identifier">keep</span>.<span class="ruby-identifier">nil?</span>

  <span class="ruby-identifier">scanner</span>, <span class="ruby-identifier">start</span>, <span class="ruby-identifier">buffer</span> = <span class="ruby-identifier">keep</span>
  <span class="ruby-identifier">string</span> = <span class="ruby-ivar">@scanner</span>.<span class="ruby-identifier">string</span>
  <span class="ruby-keyword">if</span> <span class="ruby-ivar">@scanner</span> <span class="ruby-operator">!=</span> <span class="ruby-identifier">scanner</span>
    <span class="ruby-identifier">start</span> = <span class="ruby-value">0</span>
  <span class="ruby-keyword">end</span>
  <span class="ruby-keyword">if</span> <span class="ruby-identifier">start</span> <span class="ruby-operator">==</span> <span class="ruby-value">0</span> <span class="ruby-keyword">and</span> <span class="ruby-ivar">@scanner</span>.<span class="ruby-identifier">eos?</span>
    <span class="ruby-identifier">keep_data</span> = <span class="ruby-identifier">string</span>
  <span class="ruby-keyword">else</span>
    <span class="ruby-identifier">keep_data</span> = <span class="ruby-identifier">string</span>.<span class="ruby-identifier">byteslice</span>(<span class="ruby-identifier">start</span>, <span class="ruby-ivar">@scanner</span>.<span class="ruby-identifier">pos</span> <span class="ruby-operator">-</span> <span class="ruby-identifier">start</span>)
  <span class="ruby-keyword">end</span>
  <span class="ruby-keyword">if</span> <span class="ruby-identifier">keep_data</span>
    <span class="ruby-keyword">if</span> <span class="ruby-identifier">buffer</span>
      <span class="ruby-identifier">buffer</span> <span class="ruby-operator">&lt;&lt;</span> <span class="ruby-identifier">keep_data</span>
    <span class="ruby-keyword">else</span>
      <span class="ruby-identifier">keep</span>[<span class="ruby-value">2</span>] = <span class="ruby-identifier">keep_data</span>.<span class="ruby-identifier">dup</span>
    <span class="ruby-keyword">end</span>
  <span class="ruby-keyword">end</span>

  <span class="ruby-comment"># trace(__method__, :done)</span>
<span class="ruby-keyword">end</span></pre>
                              </div>
                            </div>


                          </div>

                  <div id="method-i-read_chunk" class="method-detail ">
                            <div class="method-heading">
                              <span class="method-name">read_chunk</span><span
                                class="method-args">()</span>
                              <span class="method-click-advice">click to toggle source</span>
                            </div>

                            <div class="method-description">
                              

                              <div class="method-source-code" id="read_chunk-source">
            <pre><span class="ruby-comment"># File csv/parser.rb, line 285</span>
<span class="ruby-keyword">def</span> <span class="ruby-identifier ruby-title">read_chunk</span>
  <span class="ruby-keyword">return</span> <span class="ruby-keyword">false</span> <span class="ruby-keyword">if</span> <span class="ruby-ivar">@last_scanner</span>

  <span class="ruby-identifier">adjust_last_keep</span>

  <span class="ruby-identifier">input</span> = <span class="ruby-ivar">@inputs</span>.<span class="ruby-identifier">first</span>
  <span class="ruby-keyword">case</span> <span class="ruby-identifier">input</span>
  <span class="ruby-keyword">when</span> <span class="ruby-constant">StringIO</span>
    <span class="ruby-identifier">string</span> = <span class="ruby-identifier">input</span>.<span class="ruby-identifier">read</span>
    <span class="ruby-identifier">raise</span> <span class="ruby-constant">InvalidEncoding</span> <span class="ruby-keyword">unless</span> <span class="ruby-identifier">string</span>.<span class="ruby-identifier">valid_encoding?</span>
    <span class="ruby-comment"># trace(__method__, :stringio, string)</span>
    <span class="ruby-ivar">@scanner</span> = <span class="ruby-constant">StringScanner</span>.<span class="ruby-identifier">new</span>(<span class="ruby-identifier">string</span>)
    <span class="ruby-ivar">@inputs</span>.<span class="ruby-identifier">shift</span>
    <span class="ruby-ivar">@last_scanner</span> = <span class="ruby-ivar">@inputs</span>.<span class="ruby-identifier">empty?</span>
    <span class="ruby-keyword">true</span>
  <span class="ruby-keyword">else</span>
    <span class="ruby-identifier">chunk</span> = <span class="ruby-identifier">input</span>.<span class="ruby-identifier">gets</span>(<span class="ruby-ivar">@row_separator</span>, <span class="ruby-ivar">@chunk_size</span>)
    <span class="ruby-keyword">if</span> <span class="ruby-identifier">chunk</span>
      <span class="ruby-identifier">raise</span> <span class="ruby-constant">InvalidEncoding</span> <span class="ruby-keyword">unless</span> <span class="ruby-identifier">chunk</span>.<span class="ruby-identifier">valid_encoding?</span>
      <span class="ruby-comment"># trace(__method__, :chunk, chunk)</span>
      <span class="ruby-ivar">@scanner</span> = <span class="ruby-constant">StringScanner</span>.<span class="ruby-identifier">new</span>(<span class="ruby-identifier">chunk</span>)
      <span class="ruby-keyword">if</span> <span class="ruby-identifier">input</span>.<span class="ruby-identifier">respond_to?</span>(<span class="ruby-value">:eof?</span>) <span class="ruby-keyword">and</span> <span class="ruby-identifier">input</span>.<span class="ruby-identifier">eof?</span>
        <span class="ruby-ivar">@inputs</span>.<span class="ruby-identifier">shift</span>
        <span class="ruby-ivar">@last_scanner</span> = <span class="ruby-ivar">@inputs</span>.<span class="ruby-identifier">empty?</span>
      <span class="ruby-keyword">end</span>
      <span class="ruby-keyword">true</span>
    <span class="ruby-keyword">else</span>
      <span class="ruby-comment"># trace(__method__, :no_chunk)</span>
      <span class="ruby-ivar">@scanner</span> = <span class="ruby-constant">StringScanner</span>.<span class="ruby-identifier">new</span>(<span class="ruby-string">&quot;&quot;</span>.<span class="ruby-identifier">encode</span>(<span class="ruby-ivar">@encoding</span>))
      <span class="ruby-ivar">@inputs</span>.<span class="ruby-identifier">shift</span>
      <span class="ruby-ivar">@last_scanner</span> = <span class="ruby-ivar">@inputs</span>.<span class="ruby-identifier">empty?</span>
      <span class="ruby-keyword">if</span> <span class="ruby-ivar">@last_scanner</span>
        <span class="ruby-keyword">false</span>
      <span class="ruby-keyword">else</span>
        <span class="ruby-identifier">read_chunk</span>
      <span class="ruby-keyword">end</span>
    <span class="ruby-keyword">end</span>
  <span class="ruby-keyword">end</span>
<span class="ruby-keyword">end</span></pre>
                              </div>
                            </div>


                          </div>

                  <div id="method-i-trace" class="method-detail ">
                            <div class="method-heading">
                              <span class="method-name">trace</span><span
                                class="method-args">(*args)</span>
                              <span class="method-click-advice">click to toggle source</span>
                            </div>

                            <div class="method-description">
                              

                              <div class="method-source-code" id="trace-source">
            <pre><span class="ruby-comment"># File csv/parser.rb, line 253</span>
<span class="ruby-keyword">def</span> <span class="ruby-identifier ruby-title">trace</span>(<span class="ruby-operator">*</span><span class="ruby-identifier">args</span>)
  <span class="ruby-identifier">pp</span>([<span class="ruby-operator">*</span><span class="ruby-identifier">args</span>, <span class="ruby-ivar">@scanner</span>, <span class="ruby-ivar">@scanner</span>&amp;.<span class="ruby-identifier">string</span>, <span class="ruby-ivar">@scanner</span>&amp;.<span class="ruby-identifier">pos</span>, <span class="ruby-ivar">@keeps</span>])
<span class="ruby-keyword">end</span></pre>
                              </div>
                            </div>


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